Opening TCP:

Open TCP through the Control Panel:

To open TCP, click the Apple, then Control Panels, and finally TCP, as shown below.

The TCP configuration dialogue opens, as shown below.

Configure TCP for DSL:

Here is the main screen of TCP.

Tip: Can't make changes? Fields grayed out?  You may need to be in Administrator mode. 
      Click Edit, then User Mode, then select Administrator.

The two fields at the top determine how TCP acts on your computer.

Connect via  = Choose Ethernet if you are connecting to DSL at home.

Configure = Choose DHCP Server for typical DSL setups.

Click the Options button for some extra settings.

There should be a dot in front of Active, and a checkmark for Load only when needed.

Tip: No "Options" button?  Fields grayed out?  You may need to be in Administrator mode. 
      Click Edit, then User Mode, then select Administrator.

Click OK when you've finished.

Then close TCP to complete the configuration.